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Old 06-02-2010, 09:18 PM   #1
Shredder
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Polishing wiper marks off windscreen using Cerium Oxide

I decided to get rid of the wiper marks on my Boxster's windscreen (which were presumably a result of continued abrasion over the years). The marks were particularly visible at night when head lights, street lights or traffic lights shone on the windscreen.

I don't have a rotary polisher but I do have a DAS-6 DA. Given the hardness of glass it was going to take a decent amount of pressure and speed to polish it. As such I bought a 75mm felt pad rather than anything larger (from eBay for about £1.20), so that the machine wouldn't get bogged down. I also bought 100g of Cerium Oxide powder (again off eBay for about £4).

Products used:
  • DAS-6
  • 75mm felt polishing pad
  • Cerium Oxide powder
  • Microfibre towel - to wipe off residue after polishing
A small amount of the Cerium Oxide powder was mixed with some water to form a slurry (the result being quite runny - more so than a polish) in a squeezy bottle. It was important not to apply too much slurry to the area to be polished or else there was a lot of splatter.

In terms of speed, I found that it was optimal to run the polisher at speed 4 - at higher speeds the felt pad started to have it's fibres detach from the velcro backing plate (they got pulled out and elongated). Using quite heavy pressure (but ensuring the pad was still rotating) was much more effective at defect removal than light or medium pressure. I worked a small area at a time (around 20cm x 10cm), as I found that on larger areas the slurry tended to dry out before enough passes could be made.

Compared to polishing paint it took more time and force, but the scratches did come out.

The difference looking through the windscreen at night is huge.



Cerium Oxide Slurry:


Windscreen Before:


Windscreen After:



Last edited by Shredder; 14-08-2017 at 08:04 PM. Reason: Repair broken images
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Old 06-02-2010, 09:22 PM   #2
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What a difference
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Old 06-02-2010, 09:24 PM   #3
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This is something I've been looking to do for some time as my winscreen is particuarly bad.

Any chance you could post links to the stuff you bought on ebay and the parts water to chemical you mixed?

Cheers,
Mart
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Old 06-02-2010, 09:25 PM   #4
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< impressed

like it when solutions are customized up and work so well
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Old 06-02-2010, 09:25 PM   #5
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great turn around, did you wory about heat build up, and how long did you keep on each section?
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Old 06-02-2010, 09:26 PM   #6
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Thats a really good turn around, i think i may have to buy some of this

Can you PM me the links to the ebay stuff please
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Old 06-02-2010, 10:10 PM   #7
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Quote:
Originally Posted by somouk View Post
This is something I've been looking to do for some time as my winscreen is particuarly bad.

Any chance you could post links to the stuff you bought on ebay and the parts water to chemical you mixed?

Cheers,
Mart
PM sent with links as they (probably) aren't allowed to be posted on the board.

Anyone who wants the products just needs to search eBay for "75mm felt polishing pad" and "100g cerium oxide".

I mixed the Cerium Oxide powder with water 1:1 by volume.
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Old 06-02-2010, 10:11 PM   #8
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Quote:
Originally Posted by rusey93 View Post
Thats a really good turn around, i think i may have to buy some of this

Can you PM me the links to the ebay stuff please
Sure! PM sent.
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Old 06-02-2010, 11:14 PM   #9
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as above please, pretty please :0..
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Old 06-02-2010, 11:34 PM   #10
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Great result. I might have to give it a go myself
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cerium, glass, polishing, scratches, windscreen


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